| 词条 | Leonardus |
| 释义 |
|name = Leonardus |fossil_range = Late Santonian-Maastrichtian ~{{fossil range|84|66}} |image = Meridiolestida.png |image_caption = Leonardus (top left), alongside other meridiolestidan taxa |taxon = Leonardus |authority = Bonaparte 1990 |display_parents = 3 |type_species = Leonardus cuspidatus |type_species_authority = Bonaparte 1990 }}Leonardus is an extinct mammal genus from the Late Cretaceous (Late Santonian to Maastrichtian) of South America.[1] It is a meridiolestidan dryolestoid, closely related to the also Late Cretaceous Cronopio and the Miocene Necrolestes,[2][3] and potentially also modern marsupial mole.[4] DescriptionLeonardus is a fairly small mammal, similar in size to Necrolestes and Notoryctes. It is known from two specimens, the holotype MACN-RN 172, composed of a left maxilla, four associated molariform teeth and two pairs of alveoli, and MACN-RN 1907, a right mandible with two molariforms. Said molariforms are vaguely peg-like, with a dome-like stylocone. DiscoveryLeonardus is currently only known from the Los Alamitos Formation, Argentina. The holotype was found in 1990, while the second specimen was described more recently in 2010. ClassificationLeonardus was originally referred to Dryolestidae, but the lack of a parastylar hook on the molariforms, as well as a few features of the stylocone, suggest that it was grouped with other South American and African dryolestoids at the exclusion of Laurasian species, in a clade known as Meridiolestida.[5] Within Meridiolestida, it consistently groups with Necrolestes and Cronopio.[2][3][4]PaleobiologyLeonardus teeth are noted as being unique among dryolestids and the animal would have had an orthal and transverse jaw-stroke with tooth-to-tooth shearing,[5] though no further comments have been made on its diet.References{{Portal|Argentina|Cretaceous|Mammals|Paleontology}}1. ^Leonardus at Fossilworks.org {{Taxonbar|from=Q28045585}}2. ^1 Guillermo W. Rougier, John R. Wible, Robin M. D. Beck and Sebastian Apesteguía (2012). "The Miocene mammal Necrolestes demonstrates the survival of a Mesozoic nontherian lineage into the late Cenozoic of South America". Proceedings of the National Academy of Sciences of the United States of America. 109 (49): 20053–20058. doi:10.1073/pnas.1212997109. 3. ^1 Alexander O. Averianov, Thomas Martin and Alexey V. Lopatin (2013). "A new phylogeny for basal Trechnotheria and Cladotheria and affinities of South American endemic Late Cretaceous mammals". Naturwissenschaften. 100 (4): 311–326. doi:10.1007/s00114-013-1028-3. 4. ^1 {{cite journal | last1 = Agnolin | first1 = F. | last2 = Chimanto | first2 = N. | title = Morphological evidence supports Dryolestoid affinities for the living Australian marsupial mole Notoryctes | journal = PeerJ Preprints | volume = 2 | pages = e755v1 | date = 2014-12-22 | url = https://peerj.com/preprints/755/ | doi = 10.7287/peerj.preprints.755v1 | access-date = 2015-12-30}} 5. ^1 Laura Chornogubsky, New remains of the dryolestoid mammal Leonardus cuspidatus from the Los Alamitos Formation (Late Cretaceous, Argentina), Article in Paläontologische Zeitschrift 85(3):343-350 · September 2011DOI: 10.1007/s12542-010-0095-4 10 : Cretaceous mammals of South America|Santonian life|Campanian life|Maastrichtian life|Late Cretaceous genus first appearances|Late Cretaceous genus extinctions|Cretaceous Argentina|Fossils of Argentina|Los Alamitos Formation|Fossil taxa described in 1990 |
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